Condensing Units
CU 1 – CU 4
3.3 – 13.0 kW
TECHNICAL MANUAL
CU 1 – 4
Condensing Units
2
Condensing Units
Technical Manual : 904-020 v1.3.0 02_13
About Airedale Products & Customer Services
WARRANTY,
COMMISSIONING &
MAINTENANCE
As standard, Airedale guarantees all non consumable
parts only
for a period of
24 months
,
variations tailored to suit product and application are also available, please contact Airedale for
full terms and details.
To further protect your investment in Airedale products, we have introduced Airedale Service,
who can provide full commissioning services, comprehensive maintenance packages and
service cover 24 hours a day, 365 days a year (UK mainland). For a free quotation contact our
Airedale Service or your local Sales Engineer.
CAUTION
Warranty cover is not a substitute for Maintenance. Warranty cover is conditional to
maintenance being carried out in accordance with the recommendations provided
during the warranty period. Failure to have the maintenance procedures carried out will
invalidate the warranty and any liabilities by Airedale International Air Conditioning
Ltd.
SPARES
A spares list for 1, 3 and 5 years will be supplied with every unit and is also available from our
Spares department on request.
TRAINING
As well as our comprehensive range of products, Airedale offers a modular range of
Refrigeration and Air Conditioning Training courses, for further information please contact our
Training Co-ordinator.
CUSTOMER SERVICES
For further assistance, please e-mail: enquiries@airedale.com or telephone:
Customer Services
UK Sales Enquiries
+ 44 (0) 113 238 7789
uk.sales@airedale.com
International Enquiries
+ 44 (0) 113 239 1000
enquiries@airedale.com
Spares Hot Line
+ 44 (0) 113 238 7878
spares@airedale.com
Airedale Service
+ 44 (0) 113 239 1000
service@airedale.com
Technical Support
+ 44 (0) 113 239 1000
tech.support@airedale.com
Training Enquiries
+ 44 (0) 113 239 1000
marketing@airedale.com
For information, visit us at our Web Site: www.airedale.com
AIAC Ltd endeavours to ensure that the information in this document is correct and fairly
stated, but none of the statements are to be relied upon as a statement or representation of
fact. AIAC Ltd does not accept liability for any error or omission, or for any reliance placed on
the information contained in this document.
The development of Airedale products and services is continuous and the information in this
document may not be up to date. It is important to check the current position with AIAC Ltd at
the address stated. This document is not part of a contract or licence unless expressly agreed.
No part of this document may be reproduced or transmitted in any form or by any means,
electronic or mechanical, including photocopying, recording, or information storage and
retrieval systems, for any purpose other than the purchaser's personal use, without the express
written permission of AIAC Ltd.
2013 Airedale International Air Conditioning Limited. All rights reserved. Printed in the UK.
Condensing Units
CU 1 – 4
Condensing Units
3
Technical Manual : 904-020 v1.3.0 02_13
General Description
UNIT IDENTIFICATION
AIR COOLED CONDENSING UNIT & OUTDOOR HEAT PUMP
RANGE
CU
Condensing Unit Cooling Only
CUH
Outdoor Heat Pump
S
Scroll Compressor (Model sizes 2-4)
1-4
Model Size
HI
Head Pressure Control & Mains Isolator
Example
CUHS2
INTRODUCTION
This range of 8 air cooled condensing units and heat pumps covers the range of 3.3 to 13kW in
cooling mode.
All condensing units are factory fitted with head pressure control and mains isolator as
standard.
The range is custom designed for a small footprint, low noise level, slimline and aesthetically
pleasing appearance and lend themselves to wall mounting applications. These units can be
used with many Airedale products from the mini split Answer Cassette and Concept 2000 units,
Comfort modular comfort products and close control products. They can also be utilised as heat
rejection equipment for applications featuring other cooling units.
CE DIRECTIVE
Airedale certify that the equipment detailed in this manual conforms with the following
EC Directives:
Electromagnetic Compatibility Directive (EMC)
89/336/EEC
Low Voltage Directive (LVD)
73/23/EEC
Machinery Directive (MD)
89/392/EEC in the version 98/37/EC
Pressure Equipment Directive (PED)
97/23/EC
To comply with these directives appropriate national & harmonised standards have been
applied. These are listed on the Declaration of Conformity, supplied with each product.
CONSTRUCTION
Unit cabinets are manufactured from galvanised sheet steel coated with epoxy baked powder
paint to provide a durable finish.
Standard unit colour is Light Grey (RAL 7035).
Access to the compressors is via removable panels at the end and side of the unit.
STANDARD FEATURES
CONDENSER
A large surface area coil, ideally positioned to optimise airflow and heat transfer and
manufactured from refrigeration quality copper tubes with mechanically bonded aluminium fins.
FAN & MOTOR
ASSEMBLY
Axial flow fan assembly with low noise sickle type blades and inlet ring.
The external rotor motor allows the use of a low power output, single phase, speed controllable
motor to power the fan.
The motor has inbuilt thermal overload protection and the assembly is supplied complete with a
finger guard for protection.
COMPRESSOR
CU/CUH 1 - 1.5
Fully hermetic reciprocating compressor fitted as standard with Internal thermal motor
protection. Compressor(s) are mounted to the base via the use of vibration isolators.
CUS/CUHS 2 - 4
Hermetic scroll compressors fitted as standard with Internal thermal motor protection and
Internal pressure relief valve. Compressor(s) are mounted to the base via the use of vibration
isolators.
PRE CHARGE
All Condensing Units are supplied pre-charged with R407c for a pipe run of up to 7 metres.
Refrigerant must be added for longer pipe runs (refer to
Technical Data
for further information).
CU 1 – 4
Condensing Units
4
Condensing Units
Technical Manual : 904-020 v1.3.0 02_13
General Description
REFRIGERATION
Cooling Only
Heat Pump
Each unit features as standard:
Each unit features as standard:
Liquid Line shut off valve
Liquid shut off valve
Suction Line shut off valve
Suction shut off valve
High & Low pressure switches
High & Low pressure switches
Filter drier (loose)
Filter drier biflow (loose)
Operating Charge
Reversing valve
Defrost function
Oil sump heater
Suction line accumulator
Check valve (TEV inbuilt)
Externally equalised bi-directional
thermostatic expansion valve
CONTROLS
A custom designed microprocessor system has been developed and is fitted to the units as
standard so that an Airedale indoor unit can be matched to the Condensing unit, and
communication is available via a simple 2-wire link.
As standard the microprocessor is programmed with compressor anticycle protection, to
prevent short cycling and subsequent additional wear on the compressor, limiting the
compressor starts to 6 per hour.
As an additional feature, communication between indoor and outdoor microprocessor units is
carried by means of a low voltage 2 core screened cable.
A set of volt free contacts, to relay a unit trip, is provided as standard.
Alternatively, the condensing unit can be supplied with electro-mechanical controls – refer to
Optional Extras
for details.
ELECTRICAL
The unit control panel is fitted with the necessary contactors, sub-circuit protection and
terminals to allow efficient and continuous unit operation.
All wiring is colour coded and numbered for identification and all units are wired to current local
and European standards.
HEAD PRESSURE
CONTROL
Head pressure is maintained by a factory fitted head pressure controller which varies the
speed of the fan(s) to provide optimum control under varying ambient conditions.
MAINS ELECTRIC
ISOLATOR
To ensure complete unit isolation of the electrical panel during adjustment and maintenance.
The factory-fitted isolating device is a door interlocking type, preventing the panel from being
accessed when the unit is running.
OPTIONAL EXTRAS
Epoxy Coated Condenser
Coils
In atmospheres where high corrosion is anticipated epoxy coated aluminium finned coils can be
fitted.
Wall Mounting Brackets
To allow wall mounting a bracket and fixing kit can be supplied.
Defrost Drain Tray
A stainless steel drain tray can be provided to collect condensate when units are used in heat
pump mode. Recommended for wall mounted installations.
Hot Gas Bypass
To achieve capacity control during low load conditions or to maintain suction pressure when
used with fresh air systems, the hot gas bypass system will modulate the capacity down to
40% of full load. A stub is provided for site connection of the hot gas line to the local expansion
device. The hot gas option is supplied as a loose field fit kit.
Electro-Mechanical
Controls
The condensing unit can be supplied with electro-mechanical controls to operate via a
cooling/heating signal from the indoor unit. This is suitable where the condensing unit is
matched to a non-Airedale indoor unit.
Phase Rotation
Protection
A phase sequence relay is available for units containing 3 phase scroll compressors, to
prevent possible damage by running the compressor in the wrong direction.
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